--- a/src/wifi/model/wifi-mac-header.cc	Fri May 24 08:09:18 2013 -0700
+++ b/src/wifi/model/wifi-mac-header.cc	Fri May 24 12:50:02 2013 -0700
@@ -884,11 +884,9 @@
 const char *
 WifiMacHeader::GetTypeString (void) const
 {
-  std::string typeString;
-  
 #define FOO(x) \
 case WIFI_MAC_ ## x: \
-  typeString = # x; \
+  return # x; \
   break;
 
   switch (GetType ())
@@ -932,7 +930,8 @@
       return "ERROR";
     }
 #undef FOO
-  return typeString.c_str ();
+  // needed to make gcc 4.0.1 ppc darwin happy.
+  return "BIG_ERROR";
 }
 
 TypeId